Hi All,
Hope all are well and safe.
I am seeking inputs from colleagues on the frequency of Inline Inspection (ILI) runs for transmissions pipelines. Currently we have a time-based frequency of 5-years for each technology such as (i) MFL, (ii) Crack, (iii), IMU and (iv) Caliper. We are...
We are evaluating the use of SA 106 Gr C in place of SA 234 WPC for a boilers U-bend application. The SA 234 WPC and SA 106 Gr C have almost identical chemical composition and often used in u-bends for boilers also. In our case, as per the original design application, the boiler tubes are of SA...
In technical literature, one often reads a pharse such as: ' Material A can be used in this environment compared to Material B for any given pressure and temperature'.
It seems to me at least confusing at time. Does the above statement means that:
1: 'Material A can be used in a particular...
At one of our plants, we have a HCL transmission line of about 2 inches. The line handles HCL at 35% concentrations and at about 50C temperature that can reach in summer season. A PSV was originally installed of Stainless Steel 316 which has history of leakage. While reviewing plant data, we now...
We will appreciate views and advice from colleagues on a problem being faced by us at one of our plants. The description is as follows:
In a heat-exchanger, we have a stainless steel jacketted gasket of graphite. The temperature of the heat exchanger swings between 250-300C at a frequency of...
As part of our engineering design specification, we will be using FRP pipe for the underground drinking water utilities. Can some one guide us if there are any health related hazards in using FPR in drinking water service as undergroung pipeline.
In general when duplex stainless steel is mentioned, it is understood that it will have a 50:50 ratio of austenite and ferrite. The welknown 2205 is an example.
But, for sake of definition, does duplex stainless steel can also have 20:80 or 30:70 ratio of austenite and ferrite or ratios other...
We are working for a couple of clients in Middle East
to install On-line Sodium Analyzers in their steam
circuit. The sodium analyzer is principally meant to
monitor steam purity. We understand that such analyzers are installed in power plants and process industries to monitor High pressure...
Pb solders have been traditionally used as filler metal in restoration of auto body and repairing of car dents. Lately, ceramic putties are available for the same jobs and many auto body repair shops have shifted to using ceramic putties because the putties offers time saving and are cheaper...
We are evaluating to change one of our vessel cone in hydrogen service from the existing SS310 to Incoloy 800HT. Can someone indicate what is the prevailing market price per ton for sheet of 6-8mm of SS310 and Incoloy 800HT. Thanks.
In one of the steam service pipeline, we are evaluating using welding backing rings to ensure full weld penetration. Are there backing rings available in the market which are fully consumable? Can any one kindly guide us to the available literature on type of welding backing rings and their...
For a heat recovery pump, where the temperature is expected t rise around 800 C, we use stainless steel 316 casting for pumps body. Are there any better material such a ss310 casting that can be used?
One of our construction vendors on-site was observed using plastic tapes on stainless steel vessels as instruction markings. Our site-inspection group stopped this practice due to fear of stress corrosion cracking. Now, the vendor is using cryons for making instruction markings. Are cryons good...
If under certain extreme constraints of materials availabiltiy, one is forced to weld galvanized steel with stainless steel. Keeping in view the potential danger of Liquid Metal Embrittlement (LME), if NDT is passed after welding, is it okay to put the vessel in operation? Comments and advice...
In early 50s, failure in carbon steel steam locomotive had occured due to 'caustic embrittlement' at the riveted structure. This may be due to accumulation of caustic at the riveted locations and concentrating therby to reach a critical limit where caustic embrittlement can happen. The problem...
At our process plant, we are often given the task of recommending protective coatings for various applications for various jobs.The choice is often between
i) Fusion Bonded Epoxy;
ii) Powdered Coating through Fluidized Bed ;
iii)Electro-plating etc.
From the environmental point of view, which...
I am looking for books or manuals with Multiple-Choice Questions [MCQs] on Corrosion, Metallurgy, Electrochemistry, Design and Corrosion Control. If any of the colleagues knows any such books or manuals that may exists, I would appreciate having details, their sources and way to procure them.
We intend to use galvanized ladder to do some welding job inside 304 and 316 stainless steel vessels. The use of ladder will be temporary. We know that zinc from galvanized steel ladder can be picked up while doing welding and can be a potential threat to cause liguid embrittlement of the weld...
